There are so many women who have doubt regarding observing Vrat during monthly menstrual periods. Such doubts arise when Ekadasi, Pradosh, Sankashti Chaturthi, Karva Chauth etc falls during the monthly period. It gets even more complicated when women observe Solah Somvar Vrat, Solah Shukravar Vrat etc.

The general rule is not to count the vrat day. Do observe a fast, but don't worship God and perform puja on that particular day. This is applicable when observing solah somavar vrat etc or every month vrat or every week Vrata.

That is if you have your periods during Solah Shukravar Vrat or other such vrats you have to do the vrat a day more. The vrat on the period day is not counted. (For example if it is a sixteen Monday vrat then it becomes a 17 Monday vrat as the one during the period is not counted.)

In case of Ekadasi, Pradosh, Sankashti, Karva Chauth etc you can perform the vrat but without doing pujas. Someone in the house can do the puja instead of you.

Another question is what if you get periods on the vrat day. The same rule is applied. Stop doing pujas etc but do the fast.

(The above said is not a personal opinion...it is the general rule followed by Hindu communities.)My personal opinion is that what matters is devotion not rituals and rules. Whatever you are doing do with utmost devotion. Avoid conflict in the matter with elders and those who are not on the same page with you.Keep quiet do your puja and vrat in the way you like to do on the day. Avoid taking opinion of others. You are never wrong as long as you are doing with utmost devotion.Always remember Sri Krishna's hunger was satisfied by the sweat drenched and unclean poha given by Kuchela. Kuchela gave it with utmost devotion that is all what the Lord needs.